From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757703AbZEVVxh (ORCPT ); Fri, 22 May 2009 17:53:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757481AbZEVVxa (ORCPT ); Fri, 22 May 2009 17:53:30 -0400 Received: from one.firstfloor.org ([213.235.205.2]:39956 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757337AbZEVVxa (ORCPT ); Fri, 22 May 2009 17:53:30 -0400 Date: Fri, 22 May 2009 23:59:39 +0200 From: Andi Kleen To: Samuel Thibault , "Michael S. Zick" , Andi Kleen , linux-kernel@vger.kernel.org Subject: Re: [BUG FIX] Make x86_32 uni-processor Atomic ops, Atomic Message-ID: <20090522215939.GI846@one.firstfloor.org> References: <200905221139.26941.lkml@morethan.org> <200905221453.41895.lkml@morethan.org> <20090522200536.GZ10166@const.famille.thibault.fr> <200905221532.43775.lkml@morethan.org> <20090522204300.GA10166@const.famille.thibault.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090522204300.GA10166@const.famille.thibault.fr> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > - You got bus master DMA in your test machine? > > That's not related to the LOCK_PREFIX concern, which is about the > processor only, not interaction with other devices. Actually it's related to other devices; but only very few (most MMIO doesn't support atomic cycles and is uncached anyways). But there's no driver for real hardware in Linux that relies on it to my knowledge. -Andi -- ak@linux.intel.com -- Speaking for myself only.